Phillips (1983) has presented a novel, if not revolutionary, approach to the structural evolution of the Arbuckle uplift area in southern Oklahoma. Insofar as few detailed descriptions of southern Oklahoma geology are readily available in the international literature, we believe that this discussion is necessary to put Phillips’ paper in perspective. His essential thesis is that folded Ordovician through Mississippian rocks along the north side of the Washita Valley fault system (Figure 2) are actually gravity slides that were emplaced in the Early or Middle Pennsylvanian and, subsequently, isoclinally folded during the Late Pennsylvanian “Arbuckle orogeny.” In his paper, he...

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